Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jul 1609:30 AM EDT
-11:30 AM EDT
Is INSEAD your dream b-school and you're looking for solid prep and application strategies to get there? Check out Barkavi’s end-to-end journey to know how she did! Get insights into the INSEAD admissions process, know what Adcoms look at, and more!
Jul 1611:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
Jul 0901:00 PM EDT
-02:00 PM EDT
More Target Test Prep students are earning 100th percentile GMAT scores. Don’t settle for less when the Target Test Prep course gives you everything you need to score high on the GMAT. Start your 5-day free trial today.
Jul 1410:00 AM PDT
-11:59 PM PDT
GMAT Preparation Online - A limited time sale use code: EXPERTSGLOBAL10
Jul 1911:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment
Jul 1911:30 AM EDT
-12:30 PM EDT
Struggling to find the right strategies to score a 99 %ile on GMAT Focus? Riya (GMAT 715) boosted her score by 100-points in just 15 days! Discover how the right mentorship, tailored strategies, and an unwavering mindset can transform your GMAT prep.
04 May 2012, 20:51
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
59% (01:05) correct
41%
(00:47)
wrong
based on 481
sessions
History
Date
Time
Result
Not Attempted Yet
If \(x\) is a positive integer, is \(x\) a prime number?
(1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
(1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
Experience a GMAT Club Test Questions
Yes, you've landed on a GMAT Club Tests question
Craving more? Unlock our full suite of GMAT Club Tests here
Want to experience more? Get a taste of our tests with our free trial today
Rise to the challenge with GMAT Club Tests. Happy practicing!
24 Feb 2023, 13:58
Kudos
Bookmarks
amp0201
If \(x\) is a positive integer, is \(x\) a prime number?
(1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
(1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
Official Solution:
If \(x\) is a positive integer, then is \(x\) a prime number?
(1) \(x\) is a multiple of a prime number. If \(x=2\) then the answer is Yes (recall that an integer is a multiped of itself) but if \(x=4\) then the answer is NO. Not sufficient.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers. Any integer greater than 1 can be represented as the product of two different integers. For example, \(x=2=prime=1*2=2\) or \(x=4=not \ prime =1*4\). Not sufficient.
(1)+(2) From (2) we only get that \(x\) is not 1, which does not help us to determine whether \(x\) is prime. For example, if \(x=2\) then the answer is Yes but if \(x=4\) then the answer is NO. Not sufficient.
Answer: E
25 Feb 2023, 05:07
Kudos
Bookmarks
amp0201
If \(x\) is a positive integer, is \(x\) a prime number?
(1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
Solution: (1) \(x\) is a multiple of a prime number.
(2) \(x=a*b\), where \(a\) and \(b\) are different integers.
Pre Analysis:
- We are given that x is a positive integer
- We are asked if x is prime or not
- x can be
- 1 - Neither prime nor composite
- Prime - 2, 3, 5, 7, etc
- Composite - 2, 4, 6, 9, etc
- This statement proves that x is not 1
- However, we still don't know if x is prime or not
- If \(x=7\) (multiple of prime 7), then x is a prime
- If \(x=14\) (multiple of prime 2), then x is not a prime
- Thus, statement 1 alone is not sufficient and we can eliminate options A and D
Statement 2: \(x=a*b\), where \(a\) and \(b\) are different integers
- According to this statement, x cannot be 1
- However, we still don't know if x is prime or not
- If \(a=1\) and \(b=7\), then \(x=a*b=1*7=7\) is prime
- If \(a=2\) and \(b=7\), then \(x=a*b=2*7=14\) is non-prime
Combining:
- Even after combining, the examples of \(x=7\) and \(x=14\) still holds
Hence the right answer is Option E
